Question

1500 families with two children were randomly selected and the following information was received.

Number of girls in the family 2| 1 |0

Number of families 475 |814 |211

In a randomly selected family
(i) If there are 2 girls,
(ii) no girl, calculate the probability.​

Answer 1

Answer:

(i) Number of families having 2 girls =475

Total families =475+814+211=1500

P(2 girls) =

Total families

475

=

1500

475

=

60

19

(ii) P(1 girl)=

1500

814

=

750

407

(iii) P(No girl) =

1500

211

Sum of all these probabilities

=

60

19

+

750

407

+

1500

211

=

1500

475+814+211

=

1500

1500

=1

Sum of these probabilities =1

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